用于那些
高电流负载的直流设备
概览
SDM-CD16S 通过控制那些相对高功率的负载，包括螺线管、电磁阀、直流电机、步进电机、电灯、喇叭、加热器和风扇等，这增加了数据采集器的控制能力。
优势与特点
- Allows the data logger to automatically turn devices on or off when a threshold (for example, temperature or water depth) has been reached
- Provides a manual override
- Includes LEDs for a visual indicator of active outputs
- Drives up to 100 W of power on each channel
图像
技术说明
这种继电驱动器含有16路直流电压输出和回路，可以被手动地或在数据采集器控制之下，切换为开或关的位置。SDM-CD16S 的切换开关有3个位置：MANUAL(手动), OFF(关) 和 AUTO(自动)。当手动控制拨键被设在MANUAL(手动) 位置时，输出由单独的摇臂开关的位置来控制。OFF(关) 位置时，所有的输出都会被关闭。在 AUTO(自动)位置时，继电状态由来自数据采集器的SDM指令所控制，或者由逻辑控制输入所控制。
为 供电-到-输出 (48 Vdc 最大) 和 供电-到-SDM-CD16S 逻辑 (7 到 48 Vdc) 提供分离的输入电源，这允许在数据采集器的12 V供电给逻辑信号，而同时每路通道可以切换更高的电压。
在供电电压达 48 Vdc 及每路的最大电流可达 2 A时，SDM-CD16S 能够对每个通道驱动多达 100 W 的功率。
SDM 工作原理
SDM-CD16S 是一种同步的可编地址的数据采集器外设。数据采集器的控制端口 1, 2, 和 3 用于寻找指定地址的 SDM-CD16S，继而给8路控制口的每一个分配预期的状态。多达 15个 SDM-CD16S 控制器可以被编地址，使得一个数据采集器有可能控制最多240个端口。
数据采集器连接
建议使用CABLE5CBL-L 来连接模块到数据采集器。当数据采集器与SDM-CD16S 都被安装在同一个 ENC12/14 机箱内时，一条 1-英尺的线缆长度应当足够。 而当使用ENC16/18 机箱时，可能需要使用一条 2-英尺的线缆.线缆长度应当尽可能短；典型的最大线缆长度是 20英尺。如果需要更长的线缆时请联系 Campbell Scientific。
产品规格
| Function | Allows the data logger to control dc devices that have a relatively high-powered load, such as solenoids, solenoid valves, dc motors, stepper motors, lights, horns, heaters, and fans. |
| Number of Channels | 16 |
| Isolation | Optically isolated between the inputs and outputs |
| Logic Power Voltage | 7 to 48 Vdc |
| Logic Current Drain (@ 12 Vdc) |
|
| Toggle Switch |
|
| Supply Voltage for Output | 48 V max (dc only) |
| Operating Voltage | 12 Vdc |
| Maximum Current |
|
| Fuse | 3 AG 10 A |
| Actuation/Release Times | 8 μs/200 μs |
| Operating Temperature | -40° to +70°C |
| Maximum Cable Length |
6 m (20 ft) total to all SDM devices (Contact Campbell Scientific if longer lengths are necessary.) |
| Dimensions | 24.1 x 12.7 x 6.4 cm (9.5 x 5.0 x 2.5 in.) |
| Weight | 771.1 g (1.7 lb) |
兼容性
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
数据采集器
| Product | Compatible | Note |
|---|---|---|
| 21X (retired) | ||
| CR10 (retired) | ||
| CR1000X | ||
| CR10X (retired) | ||
| CR200X (retired) | ||
| CR206X (retired) | ||
| CR211X (retired) | ||
| CR216X (retired) | ||
| CR23X (retired) | ||
| CR295X (retired) | ||
| CR300 | ||
| CR3000 (retired) | For the CR3000, SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3. | |
| CR310 | ||
| CR350 | ||
| CR500 (retired) | ||
| CR5000 (retired) | For the CR5000, SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3. | |
| CR510 (retired) | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) | ||
| CR9000 (retired) |
Distributed Data Acquisition
| Product | Compatible | Note |
|---|---|---|
| Granite 10 | ||
| Granite 6 | ||
| Granite 9 |
Additional Compatibility Information
Enclosure Considerations
The SDM-CD16S requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. Grommets and screws are provided to attach the flanges/bracket to the backplate of our enclosures.
Power Considerations
The SDM-CD16S power requirements may be large compared to most Campbell Scientific products. For most applications, an external power supply is recommended to power the SDM-CD16S.
For some applications, it may be convenient to use the data logger’s sealed-rechargeable battery. If the data logger’s rechargeable batteries are used, the batteries need to be float charged via a wall charger or solar panel. The current available from the wall charger limits the SDM continuous output current. Campbell Scientific does not recommend using the data logger’s alkaline power supply.
常见问题解答
SDM-CD16S: 5
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The SDM-CD8S and SDM-CD16S were specifically designed to switch solenoids (inductive loads), similar to those found on valves. The diode, to protect against voltage kickback, is built into the device. The SDM-CD16AC, however, does not have this diode.
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No. The SDM-CD16S was designed to switch dc loads (7 to 48 Vdc; 2 A maximum per channel). The load power is isolated from the logic power (12 Vdc).
To switch an ac load, consider using an SDM-CD16ACA.
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The following relay devices can be used with the CR800 and the CR850:
- 7321
- A6REL-12*
- A21REL-12
- LR4
- SDM-CD8S
- SDM-CD16AC
- SDM-CD16ACA
- SDM-CD16S
The CR800 and the CR850 can also be used with a wide variety of third-party relay devices.
*Because the CR800 and the CR850 only have four digital ports, they do not have the ability to switch all six of the relays on the A6REL-12.
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Yes. Each of the channels on the SDM-CD8S and the SDM-CD16S has a manual control switch. Place the SDM-CD8S or SDM-CD16S into manual control by switching the Manual Control switch to the On position. Now each channel can be turned on or off using its respective switch.
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Yes. SDM devices are addressable. Multiple SDM devices can be connected to a data logger, as long as they all have a unique SDM address. Valid addresses are 0 through 15. Address 16 is reserved for SDM devices that support the Group Trigger Command. The address is set using the rotary switch on the face of the SDM-CD8S or SDM-CD16S.